package com.zhulin.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.zhulin.reggie.common.BaseContext;
import com.zhulin.reggie.common.R;
import com.zhulin.reggie.entity.ShoppingCart;
import com.zhulin.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加到购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据：{}",shoppingCart);
        //设置用户id
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        //查询当前菜品是否在购物车中
        Long dishId = shoppingCart.getDishId();
        if (dishId != null) {
            //菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne != null) {
            //已存在则+1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //不存在，添加到购物车
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);
    }

    /**
     * 购物车菜品数量-1
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        Long dishId = shoppingCart.getDishId();
        Long setmealId = shoppingCart.getSetmealId();

        Integer number = cartServiceOne.getNumber();
        if (number == 0) {
            //删除菜品
            if (dishId != null) {
                shoppingCartService.removeById(dishId);
            }else {
                shoppingCartService.removeById(setmealId);
            }
            return null;
        }
        cartServiceOne.setNumber(number - 1);
        shoppingCartService.updateById(cartServiceOne);


        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }
    /**
     * 清空购物车
     */
    @DeleteMapping("/clean")
    public R<String> clean() {

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }

}
